RMVB is a variant of native RealMedia file type with variable bitrate compressed by MPEG-4 Part 10 encoding techniques. Standard RM format is used for coding video with stable bitrate for online streaming. RMVB subtype is mostly used for encoding files stored locally. It is highly popular file type for spreading Asian TV episodes, movies, etc. A lot of file sharing services use RMVB for storing media content. It is supported by RealPlayer SB, Media Player Classic, MPlayer, etc.

MP4 files can contain video and sound data. It is a file container that supports different multimedia content types such as multiple audio streams, subtitles, 2D and 3D image frames. MP4 is also used for streaming media services (online or digital TV). This file type supports the control of transmission speeds for media signal, as well as correcting corrupted frames. Thanks to comparatively low system requirements, MP4 is now the most popular container type for sharing media.